Add test-env mock for EuiFocusTrap (#3930)

* add testenv mock for euifocustrap

* CL

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## [`master`](https://github.com/elastic/eui/tree/master)
 
 - Added `isLoading` and `isLoadingMessage` props to `EuiAccordion` ([#3879](https://github.com/elastic/eui/pull/3879))
+- Added `testenv` mock for `EuiFocusTrap` ([#3930](https://github.com/elastic/eui/pull/3930))
 
 **Bug fixes**
 

src/components/focus_trap/focus_trap.testenv.tsx

@@ -0,0 +1,31 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import React from 'react';
+
+export const EuiFocusTrap = ({
+  children,
+  'data-test-subj': dataTestSubj,
+}: any) => {
+  return (
+    <div data-eui="EuiFocusTrap" data-test-subj={dataTestSubj}>
+      {children}
+    </div>
+  );
+};